//
// blocking_udp_echo_client.cpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2011 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//

#include <cstdlib>
#include <cstring>
#include <iostream>
#include <boost/asio.hpp>

using boost::asio::ip::udp;

enum { max_length = 1024 };

int main(int argc, char* argv[])
{
	try
	{
		if (argc != 3)
		{
			std::cerr << "Usage: blocking_udp_echo_client <host> <port>\n";
			return 1;
		}

		boost::asio::io_service io_service;

		udp::socket s(io_service, udp::endpoint(udp::v4(), 0));

		udp::resolver resolver(io_service);
		udp::resolver::query query(udp::v4(), argv[1], argv[2]);
		udp::resolver::iterator iterator = resolver.resolve(query);

		using namespace std; // For strlen.
		std::cout << "Enter message: ";
		char request[max_length];
		std::cin.getline(request, max_length);
		size_t request_length = strlen(request);
		s.send_to(boost::asio::buffer(request, request_length), *iterator);

		char reply[max_length];
		udp::endpoint sender_endpoint;
		size_t reply_length = s.receive_from(
			boost::asio::buffer(reply, max_length), sender_endpoint);
		std::cout << "Reply is: ";
		std::cout.write(reply, reply_length);
		std::cout << "\n";
	}
	catch (std::exception& e)
	{
		std::cerr << "Exception: " << e.what() << "\n";
	}

	return 0;
}
